Have you tested it in 14w32d?
Added screenshot.
/summon FallingSand ~ ~ ~ {Rotation:[45f,0f]}
Actually, you can. I made one myself. In 14w25a/b
You can create an XRAY pack easily without large models........ Also, large models have a whole bunch of possibilities. One example is JesperTheEnd's Mario in Minecraft, which uses such large models. And besides, there are anti-xray plugins on servers. And if you're THAT worried about XRAY packs, then just implement anti-xray functionality in vanilla.
Not that I know of.
The bug can be fixed by simply making it so that the command executes after the block metadata gets set to one. If that is done, then this bug won't occur.
That didn't work either. I tested both kinds beforehand.
I tested it by hooking the clock up to a cmd block that increments a timer value by one. This value incremented 10 times a second instead of 20 times.